#!/bin/bash
#simple script menu

function diskspace {
# clear 
 df -k
}

function whoseon {
# clear
 who
}

function memusage {
# clear
 cat /proc/meminfo
}

function menu {
# clear 
  echo
  echo -e "\t\tSys Admin Menu"
  echo -e "\t1. Display disk space"
  echo -e "\t2. Display logged on users"
  echo -e "\t3. Display memory usage"
  echo -e "\t0. Exit program\n\n"
# echo -en "\tEnter option: "
 read -p "Enter option：" option
}

while [ 1 ]
do
 menu

 case $option in
 0)
   break ;;
 1)
   diskspace ;;
 2)
   whoseon ;;
 3)
   memusage ;;
 *)
#clear
   echo "Sorry.wrong selection" ;;
 esac

# echo -en "\n\n\t\t\tHit any key to continue: "
# read -n 1 line

done
#clear